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2005 Buick LeSabre Questions

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The speedometer is reading high speed while parked and while driving slow. Our fuel gauge went out earlier as well.
Check engine Lt ON. Coding a PO420 Only.
Steering shaft was disconnected from the Rack & Pinion and someone spun the wheel about 4 or 5 turn, ya I know what the (&^(**, all lights on SW off and controls not working and air bag light on. They were lucky the air bag did not deploy, probably because the switch was not in the on position.
Anyway I know I can go to the dealer but looking for instructions on replacing the harness and a possible aftermarket harness. I can remove the SW, I have no issue with that, just want to be a jump ahead on getting the harness out and in. Thanks Jim
Lights flickering while parked without keys and being on also locks are locking and unlocking while driving
What would cause that?
Like the windshield, struts and springs?
Usually stays on until I turn engine off, Could this be a sensor or something more serious?
Replaced gas cap with new GM cap. And still have the same problem.
It looks like you would use a cross-tip screwdriver to remove the access panel in the trunk, but it isn't coming loose for me.
The car will bing three times dome lights will come on and trunk ajar light will flash.
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